Clock and watch.



No. 878,076. PATENTED FEB. 4, 1908. J. L'IOHTENSTEIN. -GLOGK AND WATCH.

APPLICATION FILED JULY 8, 1907.

fnvenlar:

JULIUS LIGHTENSTEIN, OF GUTTINGEN, GERMANY.

CLOCK AND WATCH.

Specification of Letters Patent.

Patented Feb. 4:, 1908.

Application filed July 8. 1907. Serial No. 382,753.

To all whom it may concern:

I Be it known that I, J ULIUs LIOHTENSTEIN, a subject of the German Emperor, and resident of Gottingen, Germany, have invented new and useful Improvements in Clocks and I/Vatches, of which the following is a specification.

Hitherto safety-devices for clock springs have become known in which up on the spring being sufficiently wound up thewinding-up member is brought out of gear with the parts to be wound up, and that after a certain number of turns of the clock spring bolt.

The present invention provides also such'a safety contrivance, by which moreover the key is by means of a separate spring thrown off from the clock spring bolt, so that the clock spring is prevented from being further wound up. For this. purpose, the clock spring bolt is provided with the separate spring mentioned, which is freed by the wound-up spring of the clock releasing an arresting device, and which is thus adapted to throw the key off from the winding-up bolt. The arresting device consists of a pin or a pawl which catches into a notch of a sleeve which is arranged between the separate spring and the key, and which pawl carries a rod which can be turned aside by means of a projection provided on the clock spring so that the pawl leaves the notch in the sleeve and allows thus the separate spring to come in action.

The accompanying drawing shows the new safety contrivance.

Figures 1 & 2 show the same in a diagrammatical sectional elevation and plan respectively, with the clock spring in unwound position, while Figs. 3 & 4 are similar views to the former, with the clock spring in woundup position ready to throw off the key; Fig. 5 shows a modification of a single part of the device.

On the disk a a square bolt 1) is fixed on which a spiral spring (1 is disposed and connected at its upper part with a square shell 6 and at its lower part with a square shell f The latter is provided with a slot through which the clock spring 9 is passed and fixed with one end to the bolt 5 and with the other end to the outside of the disk (1. The upper shell 6 is provided with a notch e The pin it which is movably fixed on the disk a, has a 'thereby the spiral spring projection'i and carries a lateral rod is. The

clock spring g is provided with a projection Z. The key m is made to fit the bolt b.

4 The operation of the safety contrivance is as follows :In the position of the parts shown in Figs. 1 & 2, the clock spring is unwound. If now, for the purpose of winding up the spring, the key m is put on the bolt 1) one presses down the sleeve 6 and compresses (1 until the projection t of the pin or pawl it catches into the notch e of the shell 0. The winding-up of the clock spring is now effected until the rod 15 abuts against the projection l of the clock spring which gradually alters its position, whereby the rod k is shifted aside thus turning the pin h so that the projection 'L leaves the notch 0 The separate spring 61 now being untensioned, lifts the shell 6 thereby throwing the key off from the bolt 6. The

arrangement may be also made in such amanner that the upper shell 6 has, instead of a notch, a projection 6 against which strikes the projection i of the pin h (see Fig. 5).

Having fully described my invention, what I claim and desire to secure by Letters Patent 1S A safety contrivance for the springs of clocks and watches, comprising in combination with the clock spring, its winding-up bolt, and base disk; a lower sleeve (f) arranged in said clock spring, and an upper sleeve (6) arranged above said clock spring on said bolt and provided with a notch (0 a separate spiral spring arranged on said bolt between said sleeves, a key (m) designed to fit said bolt, a movable pin (h, 'L) designed to catch into the notch in said upper sleeve, a lateral rod (is) projecting from said pin, and a projection (Z) provided on said clock spring and adapted to engage said rod and thus to cause said pin to leave said notch in said upper sleeve upon the clock spring being sufficiently wound up, for the purpose set forth.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

JULIUS LICHTENSTEIN.

Witnesses:

PAUL R. THoMPsoN, ROBERT v. Below. 

